Pure instant messaging — simple, fast, secure, and synced across all your devices. One of the world's top 10 most downloaded apps with over 500 million active users.
      FAST: Telegram is the fastest messaging app on the market, connecting people via a unique, distributed network of data centers around the globe.
      SYNCED: You can access your messages from all your phones, tablets and computers at once. Telegram apps are standalone, so you don’t need to keep your phone connected. Start typing on one device and finish the message from another. Never lose your data again.
      UNLIMITED: You can send media and files, without any limits on their type and size. Your entire chat history will require no disk space on your device, and will be securely stored in the Telegram cloud for as long as you need it.
      SECURE: We made it our mission to provide the best security combined with ease of use. Everything on Telegram, including chats, groups, media, etc. is encrypted using a combination of 256-bit symmetric AES encryption, 2048-bit RSA encryption, and Diffie–Hellman secure key exchange.
      100% FREE &amp; OPEN: Telegram has a fully documented and free API for developers, open source apps and verifiable builds to prove the app you download is built from the exact same source code that is published.
      POWERFUL: You can create group chats with up to 200,000 members, share large videos, documents of any type (.DOCX, .MP3, .ZIP, etc.) up to 2 GB each, and even set up bots for specific tasks. Telegram is the perfect tool for hosting online communities and coordinating teamwork.
      RELIABLE: Built to deliver your messages using as little data as possible, Telegram is the most reliable messaging system ever made. It works even on the weakest mobile connections.
      FUN: Telegram has powerful photo and video editing tools, animated stickers and emoji, fully customizable themes to change the appearance of your app, and an open sticker/GIF platform to cater to all your expressive needs.
      SIMPLE: While providing an unprecedented array of features, we take great care to keep the interface clean. Telegram is so simple you already know how to use it.
      PRIVATE: We take your privacy seriously and will never give any third parties access to your data. You can delete any message you ever sent or received for both sides, at any time and without a trace. Telegram will never use your data to show you ads.
      We keep expanding the boundaries of what you can do with a messaging app. Don’t wait years for older messengers to catch up with Telegram — join the revolution today.
    

Telegram

Telegram Desktop based messenger with Material Design and additional features
    

materialgram

Jami, a GNU package, is software for universal and distributed peer-to-peer communication that respects the freedom and privacy of its users.
      Jami is the simplest and easiest way to connect with people (and devices) with instant messaging, audio, and video calls over the Internet and LAN/WAN intranets.
      Jami is a free/libre, end-to-end encrypted, and private communication platform.
      Jami is open-source software that prioritizes user privacy.
      Jami has a professional-looking design and is available for a wide range of platforms. Unlike the alternatives, Jami calls are directly between users, as it does not use servers to handle calls.
      This gives the greatest privacy, as the distributed nature of Jami means your calls are only between participants.
      One-to-one and group conversations with Jami are enhanced with instant messaging, audio and video calling, recording and sending audio and video messages, file transfers, screen sharing, and location sharing.
      Jami can also function as a SIP client.
      Multiple Jami extensions are available: Audio Filter, Auto Answer, Green Screen, Segmentation, Watermark, and Whisper Transcript.
      Jami can be easily deployed in organizations with the JAMS (Jami Account Management Server), allowing users to connect with their corporate credentials or create local accounts. JAMS allows you to manage your own Jami community while taking advantage of Jami’s distributed network architecture.
      Jami is available for GNU/Linux, Windows, macOS, iOS, Android, Android TV, and web browsers, making Jami an interoperable and cross-platform communication framework.
      Manage multiple SIP accounts, Jami accounts, and JAMS accounts with the Jami client installed on one or multiple devices.
      Jami is free, unlimited, private, advertising‑free, compatible, fast, autonomous, and anonymous.
      Build IoT projects with Jami. Re-use the universal communications technology of Jami with its portable library on your system of choice.
      Jami for Android TV is tested on NVIDIA SHIELD TV with Logitech cameras.
      Jami is published under the GPL license, version 3 or higher. Copyright © Savoir-faire Linux Inc.
    

Jami

HexChat is an easy to use yet extensible IRC Client. It allows you to securely join multiple networks and talk to users privately or in channels using a customizable interface. You can even transfer files.HexChat supports features such as: DCC, SASL, proxies, spellcheck, alerts, logging, custom themes, and Python/Perl scripts.

HexChat

Gajim aims to be an easy to use and fully-featured XMPP client. Just chat with your friends or family, easily share pictures and thoughts or discuss the news with your groups.
      
        Chat freely: Take your chats where you want. Use a provider of your choice and synchronize chats between all your devices. Gajim is interoperable with many other chat apps – and it's free.
        Secured conversations: State of the art end-to-end encryption for your conversations. Share messages, pictures, and files with your contacts – and only with them.
        Stay in contact: Chats and groups help you keep in touch with your friends and family. Build communities by connecting to people with the same interests. Use groups to organize the little things or the next big event.
        Express yourself: Sometimes words are not enough. Use reactions, replies, record voice messages, and send status updates to fully express yourself.
      
    

Gajim

Unofficial messaging app based on Telegram Desktop.
      Telegram is a popular messaging protocol with encryption and security as its key focus.
    

Kotatogram

Pidgin is a chat program which lets you log into accounts on multiple chat networks simultaneously.
      This means that you can be chatting with friends on XMPP and sitting in an IRC channel at the same time.
    

Pidgin

            
            Halloy is an open-source IRC client written in Rust, with the Iced GUI library.
            It aims to provide a simple and fast client for Mac, Windows, and Linux platforms.
        
    

Halloy

Messenger-GTK is a convergent GTK messaging application using the GNUnet Messenger service. The goal is to provide private and secure communication between any group of devices.
      The application provides the following features:
      
        Creating direct chats and group chats
        Managing your contacts and groups
        Invite contacts to a group
        Sending text messages
        Sending voice recordings
        Sharing files privately
        Deleting messages with any custom delay
        Renaming contacts
        Exchanging contact details physically
        Verifying contact identities
        Switching between different accounts
        Chatting live via video or voice streaming
        Sharing your screen with a selected group
      
      Chats will generally created as opt-in. So you can decide who may contact you directly and who does not, accepting to a direct chat. Leaving a chat is also always possible.
    

GNUnet Messenger

KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVirc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
    

KVIrc


      iptux is an “IP Messenger” client. The features of iptux include:
    
      
        auto-detect other clients on the intranet.
        send/recv messages to other clients.
        send/recv files to other clients.
        share your files to other cliens (with optional password protection).
      
      
      It is (supposedly) compatible with 飞鸽传书 (Feige) and 飞秋 (FeiQ) from China,
      and with the original “IP Messenger” clients from Japan, including g2ipmsg and
      xipmsg in Debian.
    
    

iptux

Kaidan is a user-friendly and modern chat app for every device. It uses the open communication protocol XMPP (Jabber). Unlike other chat apps, you are not dependent on one specific service provider.
      Kaidan does not have all basic features yet and has still some stability issues. But we do our best to improve it!
    

Kaidan

OkMSG 支持独立私有化部署的集即时消息、语音、视频通话、发送文件、会议等
         多种功能于一身的开源项目，同时让您的企业更加有效开启协作、有效沟通，
         控制成本，开拓新业务，并帮助您加速发展业务。
    

OkMSG Desktop

OkMSG 是由OkStar(okstar.org)社区开发和维护的注重数据安全与保护的企业通讯协同工具。

Flathub is the place to get and distribute apps for Linux. It is powered by Flatpak which allows Flathub apps to run on almost any Linux distribution.

Please use the flatpak manager supplied by your distribution to install add-ons.

The source code is public and can be independently audited, which makes the app more likely to be safe

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Can access the contents of the screen or other windows

Upload your app to Flathub by uploading your Flatpak manifest and supporting files to a repository in our GitHub organization. Flathub's buildbot will build the app and publish it to Flathub.

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Build your app in your own continuous integration environment and upload it directly to Flathub.

Install Flatpak

<text>Flatpak can be installed from the community repository. Run the following in a terminal:</text> <code></code>

Install the Software Flatpak plugin

<text>You can install the Flatpak plugin for either the GNOME Software (since v3.13) or KDE Discover (since v3.11), making it possible to install apps without needing the command line. To install, for GNOME Software run:</text> <code></code> <text>For KDE Discover run:</text> <codeDiscover></codeDiscover>

Add the Flathub repository

<text>Flathub is the best place to get Flatpak apps. To enable it, download and install the <filelink>Flathub repository file</filelink> or run the following in a terminal:</text> <code></code>

Restart

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text>

<text>To install Flatpak on operating systems of the Alt family, open the Terminal app and run:</text> <code></code>

<text>Flathub is a great place to get Flatpak apps. To enable it on your Alt system, run:</text> <code></code>

<text>Restart your device to complete the Flatpak installation. Now you can <link>install apps</link>!</text>

<text>To install Flatpak on Arch, open the Terminal app and run:</text> <code></code>

Enable Linux support

<text>Navigate to <settingslink>chrome://os-settings</settingslink>, and scroll down to Developers and turn on Linux development environment. ChromeOS will take some time downloading and installing Linux.</text>

Start a Linux terminal

<text>Press the Search/Launcher key, type "Terminal", and launch the Terminal app.</text>

<text>To install Flatpak, run the following in the terminal:</text> <code></code>

<text>Flathub is the best place to get Flatpak apps. To enable it, run:</text> <code></code>

<text>To complete setup, restart Linux. You can do this by right-clicking terminal, and then clicking "Shut down Linux". Now all you have to do is <link>install apps</link>!</text>

<text>To install Flatpak in Crystal Linux, you must first make sure your packages are up to date. Run the following in a terminal:</text> <codeUpdate></codeUpdate> <text>Then install Flatpak:</text> <code></code>

<text>A flatpak package is available in Debian 10 (Buster) and newer. To install it, run the following as root:</text> <code></code>

<text>If you are running GNOME, it is also a good idea to install the Flatpak plugin for GNOME Software. To do this, run:</text> <code></code> <text>If you are running KDE, you should instead install the Plasma Discover Flatpak backend:</text> <codeDiscover></codeDiscover>

<text>To install Flatpak on Deepin, run the following in a terminal:</text> <code></code>

Install the Deepin themes

<text>To install light and dark themes, run:</text> <code></code>

Install Apps

<text>elementary OS 5.1 and newer comes with Flatpak support out of the box. For non-curated apps, head to <link>Flathub</link> to install any app using the big "Install" button, and open the downloaded `.flatpakref` file with Sideload.</text> <text>Note: After installing one app from a remote like Flathub, all other apps from that remote will also automatically show up in AppCenter.</text>

<text>To install Flatpak on EndeavorOS, you must first make sure your installation is up to date, run the following in a terminal:</text> <codeUpdate></codeUpdate> <text>Then install Flatpak:</text> <code></code>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with EndeavourOS.</text>

<text>To install Flatpak on Gentoo, open the Terminal app and run:</text> <code></code>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with Gentoo.</text>

<text>To install Flatpak on GNU Guix, run the following in a terminal:</text> <code></code>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with GNU Guix.</text>

<text>To install Flatpak on Kubuntu, open Discover, go to Settings, install the Flatpak backend and restart Discover.</text>

Install the Flatpak system settings add-on

<text>To integrate Flatpak support into the Plasma System Settings, open the Terminal app and run:</text> <code></code>

<text>Flathub is the best place to get Flatpak apps. To enable it, open Discover, go to Settings and add the Flathub repository.</text>

<text>A flatpak package is available for Mageia 6 and newer. To install with DNF, run the following as root:</text> <code></code> <text>Or, to install with urpmi, run:</text> <codeUrpmi></codeUrpmi>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with Mageia.</text>

Enable Flatpak through the Software Manager

<text>Flatpak is installed by default on Manjaro 20 or higher.</text> <text>To enable its support, navigate to the Software Manager (Add/Remove Programs)</text> <text>Click on the triple line menu [or dots depending on the Desktop Environment] on the right, in the drop down menu select "Preferences"</text> <text>Navigate to the "Flatpak" tab and slide the toggle to Enable Flatpak support (it is also possible to enable checking for updates, which is recommended).</text>

<text>Flatpak support is built in from MX 18 and later. It is only required to activate the Flathub repository following these instructions:</text> <text>Open MX Package Installer (open the menu and look in MX Tools), select the "Flatpaks" tab, to activate the repository you will need to enter the root password.</text>

<text>To install Flatpak, set NixOS option services.flatpak.enable to true by putting the following into your /etc/nixos/configuration.nix:</text> <code></code> <text>Then, rebuild and switch to the new configuration with:</text> <codeRebuild></codeRebuild> <text>For more details see the <doclink>NixOS documentation</doclink>.</text>

<text>Flatpak is available in the default repositories of all currently maintained openSUSE Leap and openSUSE Tumbleweed versions.</text> <text>If you prefer a graphical installation, you can install Flatpak using a "1-click installer" from <link>software.opensuse.org</link>. If your distribution version is not shown by default, click Show under Unsupported distributions category and then select from the list.</text> <text>Alternatively, install Flatpak from the command line using Zypper:</text> <code></code>

<text>A flatpak package is available in Pardus 2019 and newer. To install it, run the following as root:</text> <code></code>

<text>If you are running GNOME, it is also a good idea to install the Flatpak plugin for GNOME Software. To do this, run:</text> <code></code>

<text>A flatpak package is available in Pisi 2.1 and newer. To install it, run the following as root:</text> <code></code>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with Pisi GNU/Linux.</text>

<text>A flatpak package is available in Raspberry Pi OS (previously called Raspbian) Stretch and newer. To install it, run the following as root:</text> <code></code>

<text>Flathub is the best place to get Flatpak apps. To enable it, run:</text> <code></code> <text>Important note: It is recommended to use Raspberry Pi OS 64-bit as newer applications are more likely to be available for that platform only.</text>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps may not be possible with Raspberry Pi OS.</text>

<text>Flatpak is installed by default on Rocky Linux 8 and newer, when installed with a software selection that includes GNOME (Server with GUI, Workstation). If you are using such a system, you may skip this step. To install Flatpak on Rocky Linux, run the following in a terminal:</text> <code></code>

<text>To install Flatpak on Solus, open the Terminal app and run:</text> <code></code>

<text>To complete setup, restart your system. Now all you have to do is <link>install apps</link>!</text> <text>Note: graphical installation of Flatpak apps is available only through GNOME Software and/or KDE Discover.</text>

<text>To install Flatpak on Ubuntu 18.10 (Cosmic Cuttlefish) or later, open the Terminal app and run:</text> <code></code>

Install GNOME Software Flatpak plugin

<text>The GNOME Software plugin makes it possible to install apps without needing the command line. To install, run:</text> <code></code> <text>Note: Ubuntu distributes GNOME Software as a Snap in versions 20.04 to 23.04, and replaced it with App Center in 23.10 and newer—neither of which support installing Flatpak apps. Installing the Flatpak plugin will also install a deb version of GNOME Software, resulting in two "Software" apps being installed at the same time on Ubuntu 20.04 to 23.04, and a single new "Software" app on Ubuntu 23.10 and newer.</text>

<text>To install Flatpak on Void Linux, run the following in a terminal:</text> <code></code>

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